新疆萨热阔布火山喷流沉积改造型金矿地球化学特征

萨热阔布金矿床位于新疆阿尔泰山南缘泥盆系康布铁堡组火山碎屑岩中 ,受断裂控制 ,成矿热液蚀变以硅化、似夕卡岩化、绿泥石化为主 ,硅化蚀变矿石富Fe2 O3+FeO、SiO2 ,而似夕卡岩蚀变矿石富CaO和Al2 O3,各种矿石富集Au、Ag、Cu、Pb、Zn、Bi、Mo、W等多种元素。成矿温度为中温 (2 40℃～310℃ ) ,流体成份以Cl-/SO4 2 -高为特征 ,矿石矿物中石英Ar-Ar年龄 (32 0Ma± 6Ma)反映最终成矿构造热液叠加年龄 ,矿床属火山喷流沉积改造型金矿床

GEOCHEMICAL CHARACTER OF THE SAREKOUBU VOLCANIC EXHALATION-SEDIMENTARY-SUPERIMPOSITION GOLD DEPOSIT IN XINJIANG

The Sarekuobu gold deposit is located on the south margin of Altay mountain, in Xinjiang. It is hosted in pyroclastic rocks and cal careous sandstone of Devonia Kangbutiebao Formation. It is controlled by NW tren d faults. There are three kinds of mineralizing hydrothermal alternation: silica te, skarnization and chloritization. The silicified ores are characterized by hi gh contents of SiO2 and Fe2O3+FeO, while skarnized ores by high contents o f CaO and Al2O3. Different ores are rich in Au, Ag, Cu, Pb, Zn, Bi, Mo, W el ements. Its temperature is about 240℃～310℃. Fluid composition features high C l-/SO42-. The Ar-Ar dating (320 Ma±6 Ma) reflects the latest hydrothe rmal mineralizing age. It is genetically a volcanic exhalation-sedimentary super imposition deposit.